Eraser structure



June 3 1924. 1,496,197

, J.AULD

ERASER STRUCTURE Filed Sept. 6, 1921 lmiembr Patented June 3, 1924,

nearer JOHN AULD, OF CHICAGO, ILLINOIS.

ERASER STRUCTURE.

Application filed September 6, 1821. Serial No. 498,768.

T all whom it may concern:

Be it known that 1, JOHN AULD, a citizen of the United States, and a resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Eraser Structures, of which the following is a specification.

My invention relates to improved holders and brush attachments therefor.

Although my invention is particularly desirable in connection with the circular.

disk type of eraser, it may also be advantageously employed in connection with the oblong type of eraser.

Usually the ordinary circular eraser has reinforcing circular metal plates secured toether by a rivet through the centre eye in the rubber disk. One of the objects of my invention is to provide an improved sup porting frame of inexpensive construction, one end of which may be used as a handle to operate the eraser more accurately, and this I do by making my improved holder, preferably, of wire bent in suitable form to support the centre of the eraser and provide a handle beyond the periphery of the disk to guide the eraser and, if desired,

carry a brush. Another object is to provide a holder that may be easily attached to the eraser in process of assembling the new parts, and detached when the rubber is worn out,

The various features of my invention are shown in the accompanying drawings, in which- 1 Figure 1 is a front view of the handle frame with brush attached;

Figure 2 shows a sectional edge view of a circular eraser with plates secured to opposite sides;

Figure 3 is a side view, with a section cut out, of the structures involved in Figures 1 and 2; V

Figure 4 shows amodifie-d form of Lolder with. brush attached;

'Figure 5 is a front view of the holder without brush attached;

' Figure 5* shows a perspective view, with a section cut out, of a modified form of 50 the circular eraser involved in Figures 2 and 3;

Figure 5 is a perspective view of a modifiedform of holder and, 1

' support the eraser.

Figure 5 is a perspective view, with a section cut out, of the holder shown in Figure 5 attached to a circular rubber disk.

Referring to Figures 1 and 2, the rubber disk 13 has the centre eye usually found in this class of eraser, and is reinforced by the circular metal disks 14 and 15 secured on opposite sides of the rubber disk by the tubular rivet 16. The rivet 16 is of greater length than the combined thickness of the rubber disk and metal side plates attached, in order to provide the projecting shank 17 to which to attach the holder shown in Figure 1, in which 6 is a bundle of bristles held in the cap 7 at the bend of -the holder 8, which is formed of a strand ofwire bent U shape, the legs of which have opposite crimps 9 and 10 forming an eye between them to receive and hold the projecting rivet shank 17. l r V Figure 3 shows the holder in Figure 1 attached to the eraser shown in Figure 2, the flange of the rivet 16'securing the holder against the plate 14 on one side of the rubber disk, while the crimped parts 9 and 10 substantially encircle the shank 17, thus clamping the plates 1%1 and 15 against opposite sides of the eraser. Figure 5 clearly shows the shank 17. The supporting side plate 141 is omitted in this figure. The operation of attaching the holder is performed. by pressing the wings 11 and 12 at the ends of the holder legs, which are expansible, against the shank 17, causing the opposing crimps 9 and 10to spread and receive the shank in the eye between them, the flange of the rivet 16 holding the legs at the crimps securely against dislodgment.

To. economize in material, I may omit one of the supporting circular disks at the side of the eraser, as shown in Figure 5", relying in its stead on the wings 11 and 12 to And to better accomplish this I may enlarge the supporting area of the wings 11 and 12 by bending the wire ends as shown by 18 and 19 in Figure 4, the holder having thus substantially the same supporting area around the central part of the eraser as the omitted plate 14:. Also the lower plate 15 may be omitted, the holder shown in Figure 5, which also has the opposing crimps 9 and 10 bent in the legs, and the wings 18 and 19, being readily attached;

in fact I may attach the holder carrying the brush to one side of the eraser and the holder without the brush on the other side, employing any suitable arrangement within the scope of the invention.

In Figure a modified form of holder, constructed of a single strand of wire, is shown, the wire being bent to form substantially parallel legs and 21, which at the free ends are bent to form the two centrall located opposing eyes 24' andQ l, and'further bent to produce the supporting wings 22 and 23 on the upper leg 2l and the opposingwings 22' and 28 on the opposite leg' 20; In Figure 5 the structure shown in Figure 5 is applied to the circular rubber disk 13, which is inserted between the legs 20 and 21, the rivet 16 through the centre eye in the rubber disk and through the opposing eyes 24 and 24f in the wings bases securing the wings 22 and 23 and 22 and 23 against the rubber diskon opposite sides, the U-sh ap'ed end of the holder 8 serving as a handle to guide the eraser more accurately in erasing, or to'support a brush, if desired. The holder and rubber disk are attached by inserting the'disk between the legs 20 and 21; then, the rive t 16, which projects equidistantly from each side of the rubber disk, is pressed sidewise through the opening between the leg 21 and theeye 24: on the upper side of the holder, an'd through the opening between the leg 20 and the e e 24 on the lower side of the holder, into the eyes 2 l24f. The inside diameter of the eyes 2424 is a little greaterthan that of the rivet shank, but attheir circumferential entrance are preferably slightly narrower (as I shown in Fig. 5 as with this construction some pressure is required to insert the rivet l6 sidewise into the eyes and to remove it therefrom, the effect being that the rivet is detachably, locked in the eyes when the holder and rubber disk are assembled in position. Obviously, however, this locking feature may be dispensed with by constructing the circumferential entrance of the eyes the same width as, or even slightly larger than, the diameter of the rivet shank, which being pocketed in the eyes is remova-bly secured therein without other holding means than the frictional engagement between the rubber disk and the holder, the arms of which snugly embrace the disk between them. 7 The holder is detached from the rubber disk by reversing the operation" above described for attaching. it.

I do not desire it to befunderstood that I 7 apply my limprovedholder only-to the circular type'of eraser having a centre eye and a rivet therein; other types of erasers, such as the ordinaryoblong type, can readily be provided with a centre eye and a rivet therein foi attachment; of the holder without departure from the spirit of my invention.

Nor do I wish to be limited to the exact conand referred to, as changes and modifications can no doubt be made and still come within the scope of the invention.

I claim as follows:

1. In combination, a flat piece of erasive material having a metallic stud projecting sidewise from the. centre thereof, said stud having a. flange on its end parallel to and spaced apart from the plane of the piece of erasive material, a flat framehaving a brush secured to one end thereof and at the other end being bifurcated whereby to be inserted edgewis'e on said metallic stud between the flange thereof and the piece of erasive material to thereby support said piece of era sive material at and adjacent to its centre, and spring means integral with said frame for detachably holding the frame in position on the stud; V

2. In combination, a flat piece of erasive material having a metallic stud projecting sidewise from the centre thereof on each side,

saidstud having a flange on each end parallel to and spaced apart from the plane of the.

pieceof'erasive material, a holder compris ing'two flat and connected frames extending parallel to one another and being spaced apart sufficiently to permit of the piece of erasive material. being-"inserted edgewise between'them, each of said frames having a" bifurcated end adapted for edgewise insertion on said metallic stud between the flange thereof and. the piece of erasive material on each side to thereby support said piece of erasive material at and adjacent to itscentre, a brush secured to said holder at the other end thereof where the two frames are connected, and means for holding said frames in position on the stud.

3. In combination, a flat piece of erasive material having a metallic stud projecting sidewise from the centre thereof. on each side, said stud having a flange on eachend parallel to and spaced apart from the plane of the piece of erasive material, and a holder comprising two flat and connected frames extending parallel to one another and being spaced apart sufficiently to permit of the pieceof erasive material being inserted between them edgewise, each of said frames at and adjacent to its centre, and means integral with said frame for detachably holding the frame in position on the stud.

5. In combination, a flat eraser having'a stud projecting sidewise from the centre thereof, said stud having a flange spaced apart from the face of the eraser, a frame extending at one end beyond the outside edge of the eraser and being suitably bifurcated at the other end for edgewise insertion on said stud between the flange and the face of the eraser to thereby support said eraser, and spring means for detachably holding the frame in position on the stud.

6. In combination, a disk eraser, a stud extending from said eraser at right angles therewith and having a flange at its outer end, and a holder adapted at one end to serve as a handle and at the other end being flat, said flat end having an eye therein for receiving the stud below its flange, the eye having a circumferential opening therein of less width than the diametrical width of the stud below its flange and being at said circumferential opening expansible, whereby the stud when forced sidewise through the circumferential opening into the eye is releasably held in the eye.

7 In combination, a disk eraser having a. stud projecting sidewise from the centre thereof, said stud having a flange on its end spaced apart from the plane of the eraser, and a detachable holder extending outwardly from the stud farther than the periphery of the eraser and having a brush secured to its outer end and at its inner end being flat, said flat end having an opening therein whereby to be inserted on the stud, said opening at one part being in the form of a circumferentially open eye for intimately receiving the stud sidewise below its flange, and said eye where it is circumferentially open being slightly expansible and of slightly less width normally than the diametrical width of the stud below its flange whereby the stud when inserted sidewise into said eye is releasably held in the eye.

In witness whereof I hereunto subscribe my name this second day of September, A. D. 1921.

JOHN AULD. 

